Copyright

Derivative works

Any content that is based on copyrighted materials is considered a derivative work, even if heavily modified. Therefore, the copyright of the original work still applies to any derivative content- so you cannot simply crop an image and call it your own, for example.

Obtaining permission

You can use copyrighted content if permission is granted by the copyright holder. Some publications allow anyone to reprint their content as long as they are credited; however, do not assume that this is always the case. Always make sure! There may be other stipulations, such as only being permitted to reproduce 200 words or fewer.

Useful information about reproduction

Education Image Gallery
Finding and Using Digital Media
Nature
New Scientist